The definition does not include homonuclear molecules which is a pain.
Single chemical element, single phase (usually solid), but different 3D structures.
The prototypical examples are the allotropes of carbon.
We define a "sugar" as either of:because these are small carbohydrates, and they taste sweet to humans.
The most important on in metabolism internals, everything else gets converted to it before being processed in the .
Nutrient that a given species cannot produce and must ingest in its diet.
Vitamins are essential nutrients that are small organic compounds.
Video 1.
The FASCINATING 200-Year History of Benzene by Chemistorian
. Source. Interesting history. Notably how things were only finally well settled by X-ray crystallography.
Active compound in pepper.

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